7.3 Unit 7 Memory Grammar（课件）

(共29张PPT)
Unit 7 Memory
Grammar
牛津深圳版　八年级上册
It is going to rain tomorrow.
I will stay at home and read a book.
Look and say
Using the structure “ if…… will do” to talk about probable results.
（谈可能的结果）
If it rains tomorrow, I will stay at home and read a book.
1
课堂导入
doesn't rain tomorrow, play football
If it doesn't rain tomorrow, I'll play football.
I'll play football if it doesn't rain tomorrow.
Using the structure “ if…… will do” to talk about probable results.
（谈可能的结果）
finish one's homework, go swimming
If I finish my homework, I'll go swimming.
I'll go swimming if I finish my homework.
Using the structure “ if…… will do” to talk about probable results.
（谈可能的结果）
be free tomorrow,
play basketball
If I am free tomorrow, I'll play basketball.
I'll play basketball if I am free tomorrow.
Using the structure “ if…… will do” to talk about probable results.
（谈可能的结果）
We use the structure “if…… do” to talk about results that certainly happen!(谈必然的结果）
If you take a fish out of water, it dies.
If you heat ice, it turns into water.
We use the structure “if…… do” to talk about results that certainly happen!(谈必然的结果）
If you put wood into water, it floats.
We use the structure “if…… do” to talk about results that certainly happen!(谈必然的结果）
We have already learnt to use conditional sentences to talk about
probable results.
2
课堂活动
A Conditional sentences(2)
If you make the picture big, strange or silly,
you will remember it better.
the simple present tense
the simple future tense
We can also use conditional sentences to talk about results that will certainty happen.
If you put salt into water, it disappears.
The if-clause talks about a possible action.
The main clause talks about the result that will certainly happen.
Work out the rule
When we use a conditional sentence to talk about something that will certainly happen, both verbs should be in( the simple present tense/the simple future tense).
Things to remember
We can also put the if-clause after the main clause.
Salt disappears if you put it into water.
A if引导的条件状语从句
在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的
事实及其产生的相关结果，从句用一般现在时态，主句用一般将来
时态。（主将从现）如：
If he comes to the party, everyone will be happy.
如果他来参加聚会，大家都会很开心的。
He will help you if you ask him．
如果你请他帮忙，他会帮你的。
语 法 解读
如果if条件句谈论的是一种真理或客观事实时，主句和从句均使用
一般现在时。如：
The room becomes dark if you turn off the lamp.
如果你关灯，房间里就一片漆黑。
If you take a fish out of water, it dies.
如果你让鱼儿离开水，它就会死。
Read these if-clauses and draw lines to match them with the results.
A1
In pairs, make conversations about the sentences in A1 on page 103. Follow the example.
S1: What happens if you take a fish out of water
S2: It dies.
S1: Are you sure
S2: Of course. I’m sure. If you take a fish out of water, it dies.
A2
Complete these sentences with the words in brackets.
1 If you________ ice, __________water. (turns/heat/it/into)
2 If you _______ steam, ___________ water. (into/cool/turns/it)
3 Oil ____________________water. (on/floats/pour/it/you)
4 Water ___________________it. ( your/heat/boils/if )
heat
it turns into
cool
it turns into
floats if you pour it into
boils if you heat
A3
B if …not and unless
The word unless can mean if ... not
The word unless can mean if ... not. For example, the two sentences below have the same meaning:
Things to remember
We can also put the if-clause and the unless-clause after the main clause.
You will be late for school
if you do not leave now.
unless you leave now.
B if... not与unless
unless = if... not，除非；如果不。如：
除非你现在就出发，否则你不能及时赶到那儿。
Unless you start right now, you will not get there in time.
= If you don’t start right now, you will not get there in time.
= You will not get there in time unless you start right now.
= You will not get there in time if you don’t start right now.
说明：if或unless引导的条件状语从句位置灵活，可放于句
首，也可位于主句的后面。当if或unless从句位于句首时，后
面通常加逗号和主句隔开。
语 法 解读
Draw lines to match the beginnings of the sentences in Column A with the endings in Column B.
B1
Rewrite the following sentences with unless.
If you do not improve your handwriting, you will lose marks in the exam.
Unless you improve your handwriting, you will lose marks in the exam./ You will lose marks in the exam unless you improve your handwriting.
2 You will get a toothache if you do not brush your teeth every day. ___________________________________
__________________________________________
__________________________________________
Unless you brush your teeth every day, you will get a toothache./ You will get a toothache unless you brush your teeth every day.
B2
3 This room will get very hot if you do not open the window.
__________________________________________________________________________________________
4 If you do not close that window, flies will get in.
__________________________________________________________________________________________
5 I will leave this restaurant if the waiter does not come soon.
__________________________________________________________________________________________
Unless you open the window, this room will get very hot.
/This room will get very hot unless you open the window.
Unless you close that window, flies will get in.
/ Flies will get in unless you close that window.
Unless the waiter comes soon, I will leave this restaurant.
/ I will leave this restaurant unless the waiter comes soon.
3
课堂小结
1.We have learned how to use conditional sentences
to talk about something that certainly happens.
2.We have learned how to use if…not and unless
一、根据句意，用if或unless连接句子。
1 They won’t understand you. You speak too fast.
.
2 She won’t play the piano well. She keeps on practising it every day.
.
3 I’m free this weekend. I’ll go to the library.
.
4 A dog barks. It is angry.
.
5 You take a fish out of water. It dies.
.
They won’t understand you if you speak too fast
She won’t play the piano well unless she keeps on practising it every day
A dog barks if it is angry.
If I’m free this weekend, I’ll go to the library
If you take a fish out of water, it dies
4
课堂练习
二、单项选择。
1 We won’t go out if it ____ tonight.
A. rain B. will rain C. is raining D. rains
If you _____ to join an educational exchange, you must apply for it first.
A. want B. wanted C. wants D. wanting
3 In hot weather, food goes bad easily __ it is kept in the fridge.
A. because B. if C. unless D. since
4 — Great news! The TFBOYS will come to our city next
week!
— Really ____ they come, my brother will be very happy.
A. Unless B. If C. Before D. So
5 — May I play the computer game
— No, _____ you promise to finish your homework first.
A. unless B. if C. but D. so
6 They ____ the Great Wall unless it _____.
A. will visit; will rain B. will visit; rains
C. visit; will rain D. visit; rains
7 — You won’t pass the quiz ___ you don’t study hard for it.
— OK. I’ll try my best.
A. and B. unless C. if D. but
8 You won’t learn Maths well _____ you work hard.
A. unless B. if C. since D. because
9 If I find your dog, I _____ you a call.
A. give B. gave C. giving D. will give
10 Mr Brown will come to our party if he ____ too busy
tomorrow.
A. is B. isn’t C. will be D. won’t be
三、用括号内所给词的适当形式填空。
1 If he (come) tonight, he will meet you at the party.
2 If the weather (get) worse, we will have to stay inside.
3 If the rain (stop) soon, will you go to the cinema with me
4 I (buy) a new mobile phone if I (have) enough money.
5 If you (drop) a glass, it (break).
comes
gets
stops
will buy
have
drop
breaks
谢谢
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